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</head>
<body>
<div class="document" id="boost-pointer-container-library">
<h1 class="title"><img alt="Boost" src="boost.png" /> Pointer Container Library</h1>

<div class="section" id="class-ptr-vector">
<h1>Class <tt class="docutils literal">ptr_vector</tt></h1>
<p>A <tt class="docutils literal">ptr_vector&lt;T&gt;</tt> is a pointer container that uses an underlying <tt class="docutils literal"><span class="pre">std::vector&lt;void*&gt;</span></tt>
to store the pointers.</p>
<p><strong>Hierarchy:</strong></p>
<ul class="simple">
<li><a class="reference external" href="reversible_ptr_container.html">reversible_ptr_container</a><ul>
<li><a class="reference external" href="ptr_sequence_adapter.html">ptr_sequence_adapter</a><ul>
<li><tt class="docutils literal">ptr_vector</tt></li>
<li><a class="reference external" href="ptr_list.html">ptr_list</a></li>
<li><a class="reference external" href="ptr_deque.html">ptr_deque</a></li>
<li><a class="reference external" href="ptr_array.html">ptr_array</a></li>
</ul>
</li>
</ul>
</li>
</ul>
<p><strong>Navigate:</strong></p>
<ul class="simple">
<li><a class="reference external" href="ptr_container.html">home</a></li>
<li><a class="reference external" href="reference.html">reference</a></li>
</ul>
<p><strong>Synopsis:</strong></p>
<pre class="literal-block">
namespace boost
{

    template
    &lt;
        class T,
        class CloneAllocator = heap_clone_allocator,
        class Allocator      = std::allocator&lt;void*&gt;
    &gt;
    class ptr_vector : public ptr_sequence_adapter
                              &lt;
                                  T,
                                  std::vector&lt;void*,Allocator&gt;,
                                  CloneAllocator
                              &gt;
    {
    public: // <a class="reference internal" href="#construction">construction</a>
        explicit ptr_vector( size_type to_reserve );

    public: // <a class="reference internal" href="#capacity">capacity</a>
        size_type  capacity() const;
        void       reserve( size_type n );

    public: // <a class="reference internal" href="#element-access">element access</a>
        T&amp;        operator[]( size_type n );
        const T&amp;  operator[]( size_type n ) const;
        T&amp;        at( size_type n );
        const T&amp;  at( size_type n ) const;

    public: // <a class="reference internal" href="#pointer-container-requirements">pointer container requirements</a>
       auto_type replace( size_type idx, T* x );
       template&lt; class U &gt;
       auto_type replace( size_type idx, <a class="reference external" href="compatible_smart_ptr.html"><em>compatible-smart-ptr</em></a>&lt;U&gt; x );
       bool      is_null( size_type idx ) const;

    public: // <a class="reference internal" href="#c-array-support">C-array support</a>
       void transfer( iterator before, T** from, size_type size, bool delete_from = true );
       T**  c_array();

    };

} // namespace 'boost'
</pre>
</div>
<div class="section" id="semantics">
<h1>Semantics</h1>
<div class="section" id="semantics-construction">
<span id="construction"></span><h2>Semantics: construction</h2>
<ul>
<li><p class="first"><tt class="docutils literal">explicit ptr_vector( size_type to_reserve );</tt></p>
<blockquote>
<ul class="simple">
<li>constructs an empty vector with a buffer
of size least <tt class="docutils literal">to_reserve</tt></li>
</ul>
</blockquote>
</li>
</ul>
</div>
<div class="section" id="semantics-capacity">
<span id="capacity"></span><h2>Semantics: capacity</h2>
<ul>
<li><p class="first"><tt class="docutils literal">size_type capacity() const;</tt></p>
<blockquote>
<ul class="simple">
<li>Effects: Returns the size of the allocated buffer</li>
<li>Throws: Nothing</li>
</ul>
</blockquote>
</li>
<li><p class="first"><tt class="docutils literal">void reserve( size_type n );</tt></p>
<blockquote>
<ul class="simple">
<li>Requirements: <tt class="docutils literal">n &lt;= max_size()</tt></li>
<li>Effects: Expands the allocated buffer</li>
<li>Postcondition: <tt class="docutils literal">capacity() &gt;= n</tt></li>
<li>Throws: <tt class="docutils literal"><span class="pre">std::length_error()</span></tt> if <tt class="docutils literal">n &gt; max_size()</tt></li>
</ul>
</blockquote>
</li>
</ul>
</div>
<div class="section" id="semantics-element-access">
<span id="element-access"></span><h2>Semantics: element access</h2>
<ul>
<li><p class="first"><tt class="docutils literal">T&amp; <span class="pre">operator[](</span> size_type n );</tt></p>
</li>
<li><p class="first"><tt class="docutils literal">const T&amp; <span class="pre">operator[](</span> size_type n ) const;</tt></p>
<blockquote>
<ul class="simple">
<li>Requirements: <tt class="docutils literal">n &lt; size()</tt></li>
<li>Effects: Returns a reference to the <tt class="docutils literal">n</tt>'th element</li>
<li>Throws: Nothing</li>
</ul>
</blockquote>
</li>
<li><p class="first"><tt class="docutils literal">T&amp; at( size_type n );</tt></p>
</li>
<li><p class="first"><tt class="docutils literal">const T&amp; at( size_type n ) const;</tt></p>
<blockquote>
<ul class="simple">
<li>Requirements: <tt class="docutils literal">n &lt; size()</tt></li>
<li>Effects: Returns a reference to the <tt class="docutils literal">n</tt>'th element</li>
<li>Throws: <tt class="docutils literal">bad_index</tt> if <tt class="docutils literal">n &gt;= size()</tt></li>
</ul>
</blockquote>
</li>
</ul>
</div>
<div class="section" id="semantics-pointer-container-requirements">
<span id="pointer-container-requirements"></span><h2>Semantics: pointer container requirements</h2>
<ul>
<li><p class="first"><tt class="docutils literal">auto_type replace( size_type idx, T* x );</tt></p>
<blockquote>
<ul class="simple">
<li>Requirements: `` x != 0 and idx &lt; size()``</li>
<li>Effects: returns the object indexed by <tt class="docutils literal">idx</tt> and replaces it with <tt class="docutils literal">x</tt>.</li>
<li>Throws: <tt class="docutils literal">bad_index</tt> if <tt class="docutils literal">idx &gt;= size()</tt> and <tt class="docutils literal">bad_pointer</tt> if <tt class="docutils literal">x == 0</tt>.</li>
<li>Exception safety: Strong guarantee</li>
</ul>
</blockquote>
</li>
<li><p class="first"><tt class="docutils literal">template&lt; class U &gt; auto_type replace( size_type idx, <span class="pre"><a class="reference external" href="compatible_smart_ptr.html"><em>compatible-smart-ptr</em></a>&lt;U&gt;</span> x );</tt></p>
<blockquote>
<ul class="simple">
<li>Effects: <tt class="docutils literal">return replace( idx, x.release() );</tt></li>
</ul>
</blockquote>
</li>
<li><p class="first"><tt class="docutils literal">bool is_null( size_type idx ) const;</tt></p>
<blockquote>
<ul class="simple">
<li>Requirements: <tt class="docutils literal">idx &lt; size()</tt></li>
<li>Effects: returns whether the pointer at index <tt class="docutils literal">idx</tt> is null</li>
<li>Exception safety: Nothrow guarantee</li>
</ul>
</blockquote>
</li>
</ul>
</div>
<div class="section" id="semantics-c-array-support">
<span id="c-array-support"></span><h2>Semantics: C-array support</h2>
<ul>
<li><p class="first"><tt class="docutils literal">void transfer( iterator before, T** from, size_type size, bool delete_from = true );</tt></p>
<blockquote>
<ul class="simple">
<li>Requirements:  <tt class="docutils literal">from != 0</tt></li>
<li>Effects: Takes ownership of the dynamic array <tt class="docutils literal">from</tt></li>
<li>Exception safety: Strong guarantee if <tt class="docutils literal">delete_from == true</tt>; if <tt class="docutils literal">delete_from == false</tt>,
and an exception is thrown, the container fails to take ownership.</li>
<li>Remarks: Eventually calls <tt class="docutils literal">delete[] from</tt> if <tt class="docutils literal">delete_from == true</tt>.</li>
</ul>
</blockquote>
</li>
<li><p class="first"><tt class="docutils literal">T** <span class="pre">c_array();</span></tt></p>
<blockquote>
<ul class="simple">
<li>Returns: <tt class="docutils literal">0</tt> if the container is empty; otherwise a pointer to the first element of the stored array</li>
<li>Throws: Nothing</li>
</ul>
</blockquote>
</li>
</ul>
<hr/><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field"><th class="field-name">Copyright:</th><td class="field-body">Thorsten Ottosen 2004-2007. Use, modification and distribution is subject to the Boost Software License, Version 1.0 (see <a class="reference external" href="http://www.boost.org/LICENSE_1_0.txt">LICENSE_1_0.txt</a>).</td>
</tr>
</tbody>
</table>
</div>
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